I own an Audi 200 with a stock Blau. Delta radio/cassette. I am second owner and in trying to code after battery disconnect, I put in wrong code. System locked went to Audi dealer for code. Supposed to be able to reset (try again with correct code) after leaving on for 1 hour. So far no luck. Display also shows the number 6. Any help would be appreciated skolu@getnet.com